There have been translations of the Divine Liturgy and books with the Divine Liturgy with notes. I know at least one book by Hugh Wybrew which looks at the Divine Liturgy as developing through time. Is there any such book on the Orthros, which may explain why it is put together the way it is, what each section of it is for, or historical development?

Archimandrite Robert Taft: Liturgy of the Hours East and West. AFAIK the only English language introductory book available on this subject. Forutunatey. it's excellent.

Logged

O Lord although I desired to blot outwith my tears the handwriting of my many sinsAnd for the rest of my life to please Thee through sincere repentanceYet doth the enemy lead me astray as he wareth against my sould with his cunning